Guiding roll of a paper making machine



De 29, 191 K. u. KONTTINEN 3,550,286

GUIDING ROLL OF A PAPER MAKING MACHINE Filed Feb. 20, 1969 x I 5. llllllllllllllllllllllllkillllllllll FIG.2

V" H64 wvsuroc K0. konttmeo AT'TQ CLNE'SS United States Patent Olfice 3,550,286 Patented Dec. 29, 1970 3,550,286 GUIDING ROLL OF A PAPER MAKING MACHINE Kauko U. Konttinen, Jyvaskyla, Finland, assignor to V almet y, Helsinki, Finland, a corporation of Finland Filed Feb. 20, 1969, Ser. No. 801,016 Claims priority, applicatiorlsFinland, Feb. 26, 1968,

4 8 Int. Cl. F26b 13/08 US. Cl. 34162 4 Claims ABSTRACT OF THE DISCLOSURE A cylinder paper drier of a paper making machine is provided with a roll guiding the endless wire of the drier. The roll guides the wire from one cylinder to another cylinder after the wire has been separated from the cylinder and from the paper web which it has pressed against that cylinder. The characteristic feature of the invention is that the guiding roll is provided with grooves of suitable shapes, including circular, helical or longitudinal grooves.

This invention relates to a guiding roll for a paper making machine and refers more particularly to a roll guiding an endless wire in a cylinder drier for paper. This roll guides the endless wire from one cylinder to another cylinder after the wire has been separated from the cylinder and from the paper web which it had pressed against that cylinder.

When a machine of this type is being operated, a wedge-shaped pressurized zone is formed in the corner between the wire guiding roll and the wire moving upon it. Pressure which is thus produced causes a flow of air around the wire and this flow produces a fluttering of the paper web behind the wire which has been detached from the cylinder. This fluttering of the paper web constitutes a substantial drawback of existing constructions since it makes it impossible to increase the speed of operation of the paper making machine beyond a certain limit. The drawback could be eliminated by placing the guiding roll at a greater distance from the cylinder, but this arrangement is unsatisfactory since it would greatly increase the length of the machine.

An object of the present invention is to eliminate this drawback of prior art constructions.

Other objects will become apparent in the course of the following specification.

In the accomplishment of the objectives of the present invention it was found desirable to provide with grooves the guiding roll for the wire in the cylinder drier of a paper making machine. When the guiding roll for the wire is grooved, no substantial pressure can be formed in the space adjacent the guiding roll and the wire extending into it which would cause the fluttering the paper web. The guiding roll may be provided with grooves located side by side and around the roll. However, the roll may have one or several helical grooves or be provided with longitudinal grooves, or with grooves of any other suitable form.

The invention will appear more clearly from the following detailed description when taken in connection with the accompanying drawing, showing by way of example only, preferred embodiments of the inventive idea.

In the drawing:

FIG. 1 is a diagrammatic elevational side view of a part of a cylinder drier of a paper making machine provided with a wire guiding roll of the present invention;

FIG. 2 is a front view of the wire guiding roll of FIG. 1;

FIG. 3 is a front view of another construction of the wire guiding roll;

FIG. 4 is a front view of yet another construction of the wire guiding roll;

FIG. 5 is a transverse section along the line V-V of FIG. 4.

The cylinder drier shown in FIG. 1 includes upper cylinders 1 rotating in the direction of the arrow a and lower cylinders 2 rotating in the direction of the arrow b. Wire guiding rolls 4 are located between and at a slightly lower level from the upper cylinders 1. The wire guiding rolls 4 are rotated in the direction of the arrow 0. A paper web 5 extends over an upper cylinder 1, then around the bottom portion of a lower cylinder 2, then over the next upper cylinder 1 and so on. A wire 3 presses the paper web 5 against the upper cylinders 1. The wire 3 extends over an upper cylinder 1, then is guided to the roll 4 and upon leaving the roll 4, moves to the next upper cylinder.

In accordance with the present invention the roll 4 shown in FIGS. 1 and 2 is provided with grooves 6 located side by side and surrounding the roll.

The grooves 6 serve as guides for the wire. When the machine is in operation, flows of air are produced which are directed toward the space around the rolls 4 and the wire 3 moving toward and engaging the rolls 4. Due to the provision of grooves 6, no substantial air pressure can be produced in this space which would result in an air flow around the wire directed against the paper web. Thus the roll of the present invention will effectively prevent the fluttering of the paper web.

In the embodiment shown in FIG. 3 the roll 4 is provided with a helical groove 6 extending from one end of the roll to its opposite end.

In the embodiment shown in FIGS. 4 and 5 the roll 4 is provided with longitudinal grooves 6 located side by side and extending from one end of the roll to its opposite end.

It is apparent that the grooves of the embodiments of FIGS. 3 and 4 will also serve the same purpose, namely, they will prevent the formation of air pressure and thus the fluttering of the paper web.

It is further apparent that various other changes can be made in the guiding rolls within the scope of the present invention. For example, the roll can be provided with a plurality of helical grooves or it can have grooves of any other suitable shape.

I claim:

1. In a drier of a paper making machine having a plurality of cylinders for drying a paper web and a wire pressing the paper web against said cylinders, a roll receiving and guiding said wire, said roll comprising at least one groove located upon its outer surface.

2. A roll in accordance with claim 1, having a plurality of circumferential grooves located side by side.

3. A roll in accordance with claim 1, having at least one helical groove.

4. A roll in accordance with claim 1, having a plurality of longitudinally extending grooves.

References Cited UNITED STATES PATENTS EDWARD J. MICHAEL, Primary Examiner 

